HIGH STRENGTH, OXIDATION AND WEAR RESISTANT TITANIUM-SILICON BASED ALLOY

摘要

The present invention relates to high strength, oxidation and wear resistant titanium-silicon base alloy containing:
2.5-12 wt % Si0-5 wt % Al0-0.5% B0-2% Cr0-1 wt % rare earth metals and/or scandium

balance Ti with unavoidable impurities.

主权项

1. A cast titanium-silicon alloy component comprising:
2.5-12 wt. % silicon; 0.3-5 wt. % aluminum; 0-0.5 wt. % boron; 0.1-2 wt. % chromium; 0.001-1 wt. % rare earth and/or scandium; a balance of titanium with unavoidable impurities; the cast alloy having a fine-grained hypoeutectic, eutectic or hypereutectic microstructure; the eutectic microstructure consists of finely dispersed Ti5Si3 silicide particles of discontinuous rod-like shape within a hexagonal close-packed α-Ti(Si) solid solution matrix; the hypoeutectic microstructure consists of primary solidified α-Ti(Si) crystals and surrounded by eutectic microstructure; the hypereutectic microstructure consists of primary solidified Ti5Si3 crystals of hexagonal shape within a eutectic microstructure; the cast alloy having a melting point of between 1330 and 1380° C.; and the rare earth and scandium are in fine dispersion of thermo-dynamically stable oxides in the cast alloy.